Speedometer.



LSAQHMME,

siem

2 SHEETS--BEEET 2.

UNITED strappa onirica.

WILLIAM rr. meermalen, or wooniavmt,

NEW

Specitcation of Letters Patent. Apn'lication liteit April t9, 19in.

Serial No. 6S'i,820.

To all 't0/wm t may concern." A

Be it .known that l, VViLLIAM l. illicit- MANN, a citizen of the United States, residing at VVoodhaven, in the county of Queens and State of N eW York, have invented a certain newr and useful Improvement in Speedometers, of which the following is a s eciication, reference being had therein to t e accompanying drawings, forming part thereof.

My invention relates to combined speed indicators and odometers, commonly known as speedometers, and more particularly tov such instruments in which the speed-indicating mechanism is of the magnetic type.A

Objects of my invention are simplicity and compactness of construction, inexpensiveness of manufacture, durability', and reliability/of operation.

Other more particular objects and advantages of my invention will hereinafter appear.

My invention includes improved means for clamping in a casing a supporting frame for the speed-indicating and odometer mechanisms.

My invention also includes improved odometer driving means combined with the speed-indicating mechanism.

My invention also includes improvei'nents in the speed-indicating mechanism.

I shall now describe the instrument. illustrated in the accompanying' drawings and embodying my invention and .shall thereafter point out my invention in claims.

Figure l is a front view of the instrument with some of the parts broken awav and others in section. elevation illustrating the odometer means as viewed from the right in Fig. 2 is a cent-ral vertical section of the instrument as l. Fig. 2a is a partial rear view. a section on a plane indicated by vthe line 2b-2b of Fig. 2 and showing additionally a portion of an attaching bracket and a sed ri vin g curin nut. Fig. 3 is a view similar to F l wit the casing and some parts of the mechanismV omitted. Fig. as viewed from below in Fig. 3. a similar view asseen from the reverse side of Fig. 4, but partly in section. Fig. 6 is a` front view of the magnetcarrier, with the magnet indicated by broken lines. Fig. 7 is Fig. la is a partial Fig. l.

viewed from the right in Fig. i F ig. Qb is 1iis an elevation Fig. 5 is a. side elevation on a .instrument motor car.

The instrument embodying my invention illustrated in the drawings has a supporting frame, upon which is mounted both the speed-indicating mechanism and the odometer mechanism. This supporting trame is composed of two principal parts or pieces; a rear partially cup-shaped part l, shown as open at one side as well as at the stront, and a forwardly located frame structure 2 extending across the open front of the rear frame part l and rigidly secured thereto by means of screws, as is shown in the drawings, the forward frame part 2 having a transverse base plate upon which are forwardly projecting standards. The entire supporting frame is firmly and securely clamped in an outer casing 3 by means now to be described.

A shouldered and screw-threaded bearing sleeve 4, which. projects from the side of the casing land at its inner end passes freely through ari-opening in the casing and screws into a thickened portion ot the side Wall of the rear trame part l, clamps the wall of the casing around the opening between the l wall. of the frame and the shoulder of the bearing sleeve, as clearly appe in F 2. ri Attaching studs 5 rigidly proj .from thickf ened portions of the bottom or back of the ,l rear frame part l through slotted holes (Fig. QJ) in the reduced scale of the back of the casing 3 and, after the application of an attaching bracket 6 and. nuts Z (Figs. 2b and 7), constitute supclamping means cooperative j with the bearing sleeve l to clamp the entire l trame in the easing 3. Small screws 8, lol cated adjacent to the attaching studs li, are

plementary (employed to clamp the rear Wall of the l frame to the back of the casing previous to j the application of the nuts 7 for holding the instrument to the attaching bracket 6 em- I ployed in mounting the instrument on the l appears in Fig. 7. j place after the apl motor car dashboard, as The screws 8 are left in plication of the bracket 6, such screws then forming supplemental clamping these screws and the elongated or slotted l holes in the casing for the studs 5 then being` covered by the attaching bracket (l i (Figs. 2l and T). The stud receiving holes l in the casing 3 are yelongated or slotted in means,

't j mounting of the assembled parts in cas order to facilitate the placing of the trame 1,-2 in the easing, particularly in view of the tact that the thickened portion et the trame part 1 receiving the bearing sleevev fl has a slight boss :fitting into a corresponding socket in the casing, as appearsin Fig. 2.

The ai'ioiiiiting ot the complete speed-indicating and odometer mechanisms on a :trame distinctfrom the casing gives free accessito'all parts of the mechanisms in assembling the instrument andalso permits complete assembling or" Working parts te be made a separate operation from the la ing, the latter operation then being a very simple and easy matter consisting only in inserting the 'frame 1 2, with the mechanisms mounted thereon, in the casing 3 and clamping the frame in place in the casing by thev means hereinbefore described.

rlhe disclosed frame-clamping means as-l sures not only the rm fixing ot the mechanisms in correct posit-ion in the easing, but.

J4.also assures proper driving relation with the tact, as Ihereinbeitore explained, `"h\at' these two mechanisms are both mounted on the common supporting frame 1--2.

'if he sjieed-indicating and odometer mecha' nisms,v as to their ctmstruction7 operation and cooperative relationship, will now be described.

A journal sleeve 10 is screw-threade l through the hase plate oit the forward' part 2 of the supporting frame and projects rigidly toward the back of the instrument. fr magnet carrier having a disk 11 and a rear- 'wardly extending hub or sleeve 12 is mounted to rotate on the journal sleeve 10, suitable hall bearings, as shown in Figs. 2 and (i, being interposed between the magnet carrier hub sleeve 12 and the journal sleeve l0. .it permanent magnet 13 ot' that well known type of horseshoe magnet commonly called a split-ring l magnet, surrounds the sleeve' 12 of the magnet carrier rearward from the disk 11. rthis magnet is shown made up of several. layers or laminat, as is generally well known in magnet construction. la keeper or magnetic bridge 14 ct paramagnetic material has a depending cylindrical skirt which` surrounds the magnet 13 in spaced concentric relation thereto and diyerts a portion of the magnetic tlux to pio' 'duce a shunt field which crosses the space or between the magnet 13 and the bridge 1li, the magnetic circuit ot the shunt held l) lo' comj'ilcted through the bridge.

rllhe magnetic iiridge 14C also has at the trout thereof an annular ila t securing portion extending inwardly alongside ot the rear tace of the magnet carrier disk 11 forwardly from the magnet 13. it spacing ring 15 of nonmagne-tic material is interposed between the magnet 13 and the 'tlat portion of the bridge la to obviate the loss ct etllective magnetism that would result by direct Contact or yclose irosimity ct the mag iet and this portion of the bridge. For this non-magnetic spacing ring l hare employed a number of thicknesses oit rardboard, that being the material indicated in the drawings. The magnet 13 and the bridge 14; are firmly secured to the magnet carrier by means of non-magnetic screws t6 passing through the disk 11 of the magnet carrier., tliiongh the fiat securing portion ot the bridge 14, through the spacing ring 15, and through all the laminaeof the magnet 18, being screw-threaded into the last or rearmost oit these laminac only, passing freely through thc other laminte. The disk 'L1 ot the magnet carrier projects peripherally beyond the annular; skirt ot' the bridge tet and such projecting portion is provided on its rear sidewith bevel gear teeth 17 Aforming bevel gear on the side ot the magnet carrier disk l1 adjacent to fily magnet 1:3. Rotation is communicated to the magnet carrier and to the parts'carricd thereby, including the magnet 13, there-- a .rotating magnetic field, by

of.' a l) vel pinion 1S meshing with the and on the inner end ont by producing ball hearings, r outer cnil or tl c interposed suitable nown in 2. tort sli-att 9 is adapted L to lic connected to. the usual flexible shaft tor transmitting` rotation from a ground Wheel ot the motor car, and the bearing sleeve 4 is adapted to receive the usual covering for the flexible ,sh-ath lt appears from vthe foregoing that the magnet 13, and hence the magnetic iield, will be rotatedfproportional to the speed of -the motor car.

rthe motor ear speed in miles per hour is indicated on a suitably calibrated dial 19h37 a j'ioiuter or hand 2O carried by thert'orward nd ot a pointer shaft d1 pivoted in the rain A ivQ; and such speed is measured by ai spring 22 attached at its inner end te lie pointer shaft 21 and anchored at` itsfy pointer shaft 2l by 28 notamos screwed into the frame of the instrument is attached to the' pointer the intermediary t a collar 2G and is anchored to the frame part pin 27.

Triplace a torque upon the pointer shaft 21 proportional to 'the rotative magnet 13, and therefore proportional to the speed or travel ot' the motor ca magnetic electrically conductive cup constituting magnet 13 and has a cylindrical shell eX- tending'forward between. und in concentric and thc shirt of but slightly spaced from both relation to the magnet i3 the keeper 14, the magnet and the freely swing or oscillate in t across which a portion of 1s diverted by the keeper keeper, being able to he air-gap conductive cup 28 is shown cup 28 may be composed of any suitable electrically conductive non-magnetic mate-- The means for ward side, opposite to rial, of which aluminum is a good example and which I have employed in the-instrument illustrated in the drawlngs. The roforce to cut the conductive cup 528 and, in accordance with well understood laws, will produce eddy currents in the electrically conductive cup 28 and will set up a torque in such cup proportional `to the speed of rotation of the magnet 13. This torque, imparted to the pointer shaft 2l' by the cup 28, is measured by the hair spring and indicated on the dial 19 by the pointer 20.

driving the odometer mechanism from the speed-indicating mechanism will now be described. i

The magnet carriei--`dislr 11 on its iforthe magnet i3 and opposite to the gear teeth. 17, has a plane face directed toward the .trent or' the instrument and provided with a ridge arranged 1n a flat spiral forming a volute worin 30 for driving the odometer mechanism.

The odometer mechanism i tselt may be o t any suitable construction and hence that embodied in the present instrument and illustrated in the drawings will be only generally described. It comprises, as is common, two sets of number wheels, the upper set of three wheels 31 belonging towhat is commonly. known as the trip indicator and the lower set of five wheels 32 belong'- ingto the totals indicator. The trip indicator only, as is common practice, is equipped with resetting means tor resetting the number wheels to the zero indication, such resetting Ineens being indicated on the drawings by the exterior thumbwheel 33 Vfixed on an inwardly headed and part 1 at the back and the hair spring 22 shaft 2l through 2 by ineens oit a speed of the a nonlk/7 a magneticallydntiuenced part, 1s carried by the vpointer shaft back of the the magnetic luX The central portion of the bottom or flat portion of the as secured to the means of a hub 29. The

terminally flattened resetting shaft 34, the flattened end of which detachably takes into a slot in the adjacent projectin end of a shaft 35 carrying the number W eels 31 oil thc trip indicator.

y incidentally it is to be noted that the reset shaft 34 is carried by a screw-threaded plug screwed into a boss on the casing 3, thereby permitting the reset shaft 34 to be placed in position after the supporting trarne 1&2, with the mechanisms carried thereby, has been inserted and clamped in position in the casing 3, as otherwise the inwardly projectinglr end of the reset shaft 34 would be somewhat in the way in insertd ing the frame 1.--2 into the Casin 3.

lhe number wheels shaft 35 0% the trip indicator and a number wheels shaft 37 carrying the number wheels 32 of the totals indicator are both mounted in the f9rwardly projecting standards of the forward frame part 2, the former shaft being rotative to accomplish the resetting of the trip indicator wheels 31, as hereinbefore menof the trip inditioned. The units wheel cator wheels 3l is driven in unison with the units wheel of the totals indicator wheels 32 from the latter by means of an intermediate idler gear 38 engaged by the driving pins on the side of the units Wheel of the totals indicator and meshing with a gear 39 loosely mounted on the trip indicator num-l er wheels shaft. 35 to the units wheel of y, the trip indicator through a spring-pressed 4pawl-fl() carried by the gear 39 and a ratchet 41 connected directly to the units number wheel bi the trip indicator, the ratchet conr'iection.v providing for effecting the resetting hereinbefore described.

The units number wheel of the totals inolcator is driven from the volute odometerdriving worm 30 located on the plane forward tace of the magnet carrier disk 11. For thus driving on the magnet carrier engages a gear 42 fixed on the end one of the standards of the forward frame part 2, and the other endof the shaft 43 the odometer the worm 30.

of a shaft 43 journaled in carries a combined actuating and locking disk fifi provided with a' peripheral notch and two laterally projecting pins, one at *each side of the notch, this device being commonly known as aV one-tooth pinion. An idler transmitting pinion 45, having alternate longv and short teeth, in all four long teeth and'four short teeth, engages the units wheel of the totals indicator, two

of the long teeth of the pinion 45 resting upon vthe smooth portion ofthe of its two pins strikes a short tooth of the periphery pinion will be rotated to the extent of two ot' its teeth by the two pins, the notch at this point in the periphery ot the one-tooth pinion 4-'1Y pcrmiltiiu;` the passage of a long tooth ol the transmitting pinion 44, after which the smooth poi-lion oi' the periphery of the omi-tooth pini-m il again locks the transmitting pinion V'lraarhicli latter'in turn locks and holds the units wheel of the totals indicator, such units Wheel having been moved a. step canal -lo the distance between its indicating nun'ibers.

indicating movement may be transmitted in any suitable manner from the units number wheels successively to the other number wheels. `ln the odometer mechanism illus- (rated in the drawings, intermediary eighttoothed j transmit-ting pinions 4G having alternate short and long teeth, in all rel spectssimilar to the initial transmitting pinion 145, are4 employml for this purpose and `operate in substantially the same manner asthe pinion 45, .lt should be noted that the transn'iitting pinions 4G 'for the; number wheels of the trlp indicator' are l arried by a singing-pressed swinging traine 47, as is known in the art,y which will yield away `from the number` wheels to permit their being reset, as hereinbefore set forth.

The location oi: the disk 11 of the magnet carrier inthe casing 3 of the instrument forward from the parts ot the speedindi eating mechanism carried by the magnet carrier, with the placing ot the odometerdriving worm S30 on the forward face of the magnet carrier disk` 11, contributes largely both to simplicity and compactness of construction. According to mv invention, the speedindicating mechanism alone is directly driven by the driving shaft 9, and the ymagnet carrier is so constructed and arranged as to transmit driving movement to" the odometer mechanism, the driving means for the odometer mechanism thus being combined with the speedsindicating mechanism.

By reason of the fact that the magnet carrier.V disk 11 projects peripherallylI beyond the parts carried thereby, including' the magnetl and the annular magnetic bridge 14, space is provided thereon for the odometer-driving Worm 30 at the front-and for the bevel gear.\17 at the back of such disk.A This construction provides for rotating the magnet carrier from theipinion 1 8 and alsoifor rotating the gear 42 of the odometer mechanism from the 4magnet carrier. l

- The provision of the fiat yannular securing portion on r"the magnetic bridge 14` permits this 'bridge' andthe magnet. 13 to be secured to the magnet carrier by means of a-single.

set of screws lgqwhile the bridge 14 may be readily and, inexpensivcly 'stai'nj'ied out with the iiat securing portion and cylindrical skirt complete.

It is obvious that `various modifications `may be made in the construction shown in the drawings and above particularly described within the principle and scope of my invention.

I claim 1. A speedometer con'lprising a casing, a supporting frame in the casing, speed-indi'- 'eating mechanism supported by the frame, a

bearing sleeve engaging the trame and the casing to clamp the frame to the casing, and a shaitjournaled 1n the bearlng sleeve for driving the speed-indicating mechanism.

2. A Lspeedometer comprising a easing, a

Asupporting frame in the casing, speed-indi Vsleeve engaging the frame and the casing to clamp the frame to the casing, and a shaft journaled in the bearing sleeve for drivingv the mechanisms supported by the fra-me.

4t. A speedometer comprising a casing, a supporting frame in the casing, speedindieating mechanism supported by the frame, a beariner sleeveengaging the ,frame and the casing to clamp the frame to the casing, an attaching stud for the instrument secured to the frame and .projectino to the outside of the casing and serving to ttiurther clamp the frame to the casing, and a shaft journaled in the bearing sleeve for driving the speedindicatingmechanism.

5. Al speedometer comprising a casing, a

supporting frame in the casing, speed-mdr 'eating mechanismandodometer mechanism both supported by the frame, a bearing sleeve projecting from the side of the casing and having screw-threaded engagement 110 i with theframe to clamp the 'frame to the` casing, attaching studs carried by thel trame and projecting through the back of the casing to further clamp the frame to the casing, and a shaft journaled ,in the bearing 115 sleeve for driving the mechanisms supported by the frame.

6. A speedometer comprising speed-indiu Qcating'mechanism including a rotative magnet' carrier having a plane face4 provided 120 withl a\ volute odometer-driving A Worm and a rotative magnet mounted on the magnet carrie-r, and odometer mechanism including a gear engaged by the worm' o`f the magnet carrier.

"2'. AVV speedometer comprising a casing, speed-indicating mechanism including a rotative magnet carrier having a plane face directed toward the front of the casingand provided with a volute odometer-driving 130 Worm and a rotative magnet mounted on the magnet carrier, and odometer mechanism in. the casing forward trom the magnet carrier and having a gear engaged bythe worm of the magnet carrier.

8. A speedometer comprising a casing, a. supporting frame in the easing, speeohindieating mechanism including a journal sleeve projecting rearwardly from the trame, a magnet carrier rotatively mounted onV the journal sleeve anddiaving a plane face directed toward the front ot' the casing, "ich face being provided with a volute odometerdriving Worm, a rotative magnet carried by the magnet carrier, a magnetically-.intluenced part within the magnetic infhiencc of the magnet, a pointer shaft rotatively carrying such part and extending through the journal sleeve of the frame; and odometer mechanismy inclmling'ay gear engaged by the Worm ron the magnet carrier.

Si. A speedometer comprising speed-indit eatingl mechanism including a. rotative magdieating mechanism including a rotative .arten not. carrier having` a disk portion, a magnet, carried by the l'nagnet carrier to rotate therewith and of less diameter than the disk portion of the magnet carrier so that the latter projects peripherally beyond the magnet, gear teeth being' port-ion ot the magnet carrier disk onthe same side thereof as the magnet, a driving pinion meshing' with the gear teeth ot' the magnet carrier, and means for communieating rotation to the pinion.

l0. A speedometer coi'n'prisingr speed-inl dicating mechanism including a rotative magnet carrier havingl a hoh sleeve and' a disk portion provided on one o't its sides with a volute odonletter-driving Worn-1 and on the other of its sides With gear teeth, a vrotative magnet carried by the magnet carrier inward] 7 from the gear teeth on the toothed side et' the magnet carrier, odometer mechanism adapted to be driven `by the Worm of the magnet carriery a pinion meshing with the gear teeth' of the magnet carrier, and means for communicating rotation to the pinion.`

LLA speedometer comprising speed-inmagnet carrier having a hub sleeve and a disk portion, a magnet surroundingr the hub sleeve, a magnetic bridge having a cylinportion surrounding and radially spaced from the magnet and having a flat portion interposed between the magnet and the fdisk portion of the magnet carrier, and means in common :for securingA the magnet and the1 bridge te the irnagnet'` carrier.

provided on the project-ing'.

'jects periph-rally `the gear teeth ot the magnet including a magnet carrier having' a plane aceprovided with a volute odometeredriv'ing Worm and a rotative magnet mounted on the magnet carrier, odometer mechanism including a Lnfear engaged bythe Worm et the magnet carrier, a supporting frame in common forI supporting both the speed-indicating mechanism and the odometer meehanl i, a easing', ay hearing' sleeve engaging' the trame and the 'easing` to clamp the vtrame to the casing, and a shaft iournaled in the hearing sleeve for driving the mechanisms supported by the trame.

14.. A spmdomeier Comijrising' a easing, a supporting; trame in the casingi speedindi eating me,...y and odometer mechanism both supported ov the trame, the speed-indicating mechanism including a rotative magnet. carrier jouii'naled on the frame and havingl a huh sleeve and a diskkportion, a magnet around the huh sleeve and rotative .vith the magnet carrier. the magnet beingr ot less diameter than the disk portion of the magnet carrier so thaty the latter probeyond the magnet, such projeeiinp; portion being' provided With gear teeth, located on the saine side oit the magnet carrier disk as the magnet` a volute odometer-driving Worm` beinga provided on the' other side oit such disk and directed toward the front ot the casing', a hearing' sleeve projectingf from the casing and haring scrcW threaded engagement with the frame to clamp the 'trame lo 'the easing, a drive shaft .journaled in. carried by the drive shaft and meshing With carrier; and the odometer mechanism including a gear engaged by the ivorm on the magnet carrier.

In testimony whereof- I have afixed my signature in presence ot two witnesses.

' VlTl'LLlIAh/i: lli. ZACHMANN. Viitnesses idler. iisnnni" Kia-inizi',

Ehrmann ,ovvnii.

lot

the hearing sleeve, a pinion i 

